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Cover
Jan. 04, 2021
Oct. 22, 2020
Entity Information [Line Items]    
Document Type 8-K  
Entity Registrant Name Hawaiian Electric Industries, Inc.  
Entity File Number 1-8503  
Entity Tax Identification Number 99-0208097  
Entity Incorporation, State or Country Code HI  
Entity Address, Address Line One 1001 Bishop Street, Suite 2900  
Entity Address, City or Town Honolulu  
Entity Address, State or Province HI  
Entity Address, Postal Zip Code 96813  
City Area Code 808  
Local Phone Number 543-5662  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of each class Common Stock, Without Par Value  
Trading Symbol HE  
Security Exchange Name NYSE  
Entity Emerging Growth Company false  
Entity Central Index Key   0000354707
Amendment Flag   false
Document Period End Date Jan. 04, 2021  
Hawaiian Electric Company, Inc.    
Entity Information [Line Items]    
Entity Registrant Name Hawaiian Electric Company, Inc.  
Entity File Number 1-4955  
Entity Tax Identification Number 99-0040500  
Entity Address, Address Line One 1001 Bishop Street, Suite 2500  
Entity Address, City or Town Honolulu  
Entity Address, State or Province HI  
Entity Address, Postal Zip Code 96813  
City Area Code 808  
Local Phone Number 543-7771  
Entity Emerging Growth Company false  
Entity Central Index Key   0000046207
Amendment Flag   false